land product validation subgroup activity in support of lai inter-comparison
TRANSCRIPT
Land Product Validation subgroup activity in support of LAI inter-comparison
overviewoverview
• Compile critical bibliography
• MODIS LAI-product distribution
• Continued communication
• Maintain participating site catalog
compile critical bibliography
compile critical bibliography
• Web based
• Limited to the work directly related to validation of satellite derived LAI products
• Initial list started here
compile critical bibliography
compile critical bibliography
• Topic: biophysical• Subtopic, lai • AuthorMain, • AuthorOthers • Title, • Journal,• Source (person or place submitting entry), • Keywords• Date (year), Volume, Number, Page
MODIS Land product distribution
MODIS Land product distribution
• 200km by 200km subsets over all EOS Land Validation Core Sites(http://modis-land.gsfc.nasa.gov/val/coresite_gen.asp)
• 11km by 11km subsets over select FLUXNET sites
• Additional subsets possible (produced and ftp-transferred)
• Global products available through EDG(http://edcdaac.usgs.gov/modis/dataprod.html)
continued communication
continued communication
• One of the results of this meeting should be a method for continued interaction
• Protocol documentation as near-term objective
• Joint proposals / financial support could help future international quantitative efforts
continued communication,
cont.
continued communication,
cont.• Interaction with IGOS “TCO” theme• Input from TCO meeting
(Ojima, Plummer, et al.)– Saturation at LAI > 6 is an issue– Seasonality/time-series is critical– LAI is used a model constraint, not imput– Uncertainty estimates could be incorporated
into modeling
site catalogsite catalog
Ba
rto
n B
en
dis
h
Bo
nd
vill
e
BO
RE
AS
NS
A
BO
RE
AS
SS
A
Bra
ss
ch
aa
t (D
e In
sla
g)
Ha
rva
rd F
ore
st
Jrv
se
lja
Ke
jimk
ujik
Pa
rk, N
ov
a S
co
tia
Ko
nza
Kra
sn
oy
ars
k
La
nd
es
Ma
li
Ma
un
Mo
ng
u
Ok
wa
Riv
er
Pa
nd
am
en
tan
ga
Pa
rk F
alls
Po
dk
am
en
na
ya
Ro
mill
y
Ru
ok
ola
hti
Sk
uk
uza
Ts
ha
ne
Wa
tso
n L
ak
e, Y
uk
on
Zo
tin
o
IKONOS x x x x x x x x x xLandsat x x x x x x x x x x x x x x x x xSPOT HRV x x x x xVEGETATION x x x x x x x xSeaWiFSAVIRIS x x x xCASI x xADAR x x x xHYMAP xMETEOSAT xDAIS xAVHRR x x x x x xMODIS subseton-line
current
planned
Ba
rto
n B
en
dis
h
Bo
nd
vill
e
BO
RE
AS
NS
A
BO
RE
AS
SS
A
Bra
ss
ch
aa
t (D
e In
sla
g)
Ha
rva
rd F
ore
st
Jrv
se
lja
Ke
jimk
ujik
Pa
rk, N
ov
a S
co
tia
Ko
nza
Kra
sn
oy
ars
k
La
nd
es
Ma
li
Ma
un
Mo
ng
u
Ok
wa
Riv
er
Pa
nd
am
en
tan
ga
Pa
rk F
alls
Po
dk
am
en
na
ya
Ro
mill
y
Ru
ok
ola
hti
Sk
uk
uza
Ts
ha
ne
Wa
tso
n L
ak
e, Y
uk
on
Zo
tin
o
High res LAI map
canopy multispectral reflectance (nadir or bidirectional) leaf spectra (reflectance and transmittance) background nadir spectral reflectance (soil + litter) fraction of area vegetation cover vegetation crown allometry (height, width, gap) phenology (green-up, mature, senescent stage) vegetation composition (either by species or structural type) wet or dry status fraction of non-photo vegetation (at min. photosynthetic activity stage) meteorological data (minimum set)
CEOS Land Product Validation Core SitesCEOS Land Product
Validation Core Sites
• Potential joint project with CEOS Working Group on Information Systems and Services (WGISS) being led by the LPV
• Easy-access web-based access to land products from CEOS members – could include LAI from multiple sensors.
SATELLITE DATA from various CEOS Member sensors, subsetted over the site and WWW accessible.
Ancillary/GIS Layers such as… - elevation - land cover - reference layer (with political boundaries, airports, water bodies)
Scientific Networks such as AERONET and FLUXNET data ILTERs
Field and airborne data WWW accessible
Graphic courtesy of the BigFoot program
Data Compilation for Land Validation Core Sites
Data Compilation for Land Validation Core Sites
EOS (NASA)VALERI (CNES)VALERI (EC?)VALERI (China?)
Distribution of Sites
Distribution of Sites
( both EOS and VALERI)
EOS Core Sites infrastructure as example
EOS Core Sites infrastructure as example
EOS Core Site web page provides link to on-line ftp directories
EDC DAAC:MODIS, ETM+, ASTER
SeaWiFS subsetsat GSFC
Ancillary dataat Umd…
Field data “locally” maintained
ORNL Mercury system:Archive and access offield data
WGCV/WGISS conceptual interaction
WGCV/WGISS conceptual interaction
WGISS:provide seamless internet-based access to the multiple data sets
WGCV: • site locations and data set requirements, • negotiate subsetting and on-line storage of core site data• some correlative analysis on these data, and • interpretation of possible discrepancies between products
WGCV/WGISS Example
WGCV/WGISS Example
WGISS:Provides single file with MODIS/MERIS surface reflectance as multi-layer product
MODIS Land Validation Team (MLVT)Subset and place on-line MODIS surface reflectance for Core
Sites
MERIS and AATSR Validation Team (MAVT)Subset and place on-line MERIS surface reflectance for Core
Sites
Action Items/Wrap-up
Action Items/Wrap-up
• Presenters to provide electronic copy and any related bibliography to Morisette
• Morisette to post presentations on LAI page
• Baret to prepare summary of a.m. discussion, and forward to Morisette
• Privette, Morisette, Weiss and Baret to prepare Earth Observer article and ESA EO 1/4ly.
• Gower to start outline for LAI validation guideline article (author=“LPV” contributing authors listed in table alphabetically)Deadline: before CEOS plenary, November 2001
• Morisette to keep group informed on the outcome of CEOS Land Validation Core Sites
• Myneni/BU to provide “user support” for MODIS LAI product-subset tool, et al.
• VALERI, BigFoot, CCRS to provide access to high-res LAI maps or field data
• Gower, Privette, Morisette to revisit global representation–fill gaps
• Privette to write GOFC or TCO requesting delegate on LPV (Baret)
• Next meeting or steps